Locking device for bayonet slot constructions



March 7, 1933. I S.SCHlFF Filed March 15, 1930 Patented Mar. 7, 1933 j f 'U N IT ED same-1s 'SIGMVUNDJ'SCHIFR'OF CINCINNATI, OHIO, ASSIGNOR'TO THE apmnarcomrnmr, or OINGINNATIJQHI A CORPORATION 'OF'OHIO PA TiEzNT tor-2R1- CE LLOCKING DEVIGE IEOR BAYONETSL'O T CONSTRUCTION S Application filed 'March 15, 1930. Serial No. 436,136.

This invention relates to a bayonet slot "construction with: locking means associated therewith. 7

An object-of theinvention is'to provide such a device in which-the locking-means are self-positioning and: self-locking.

Another object is to provide such-a construction in which theparts maybe-readily unlocked and disengagedfrom-operative relationship.

Another object is the prov-ision'of means of the class described which -are-simple and inexpensive to manufacture.

These and other objects are attained by-the 'means' described herein and set forth in the accompanying drawing. I

It :is to be understood that the device of my invention concerns itself, with 7 Variety of constructions in which a bayonet :slot structure is utilized. Moreover, the-constructions particularly contemplated are those in which the movable parts j oined bya bayonet slot coupling are'intended for temporary rather than permanent engagement so that a certain 'amountof play or back-lash'be- -twee n=the*parts can be expected. For the sake of presenting the invention in :a definite relationship, the device is I herein illustrated as-associated with-a dough-mixing machine such as that set :forth in my copendingapplication, Serial 'Number' 320,91-4, filed N0- vember 21,1928.

Fig.1 is an isometric view of a-section of-a shafthaving the lockingmeans ofthepresent I invention attached thereto. I

- Fig. 2 is an-isometricview ofa removable 'ated.

Fig. 4 is an elevational view, partly in section-ancLpartly broken away, ofaportion of a shaft having a removable member connected therewith, said parts being associated with the means of thepresent invention. g

V Fig. -5 is a top plan viewof theelements "shown in Fig. 4, withthe parts in loekedrelationship.

6 is a detail view showing the means of this inventionpartly in cross section and connectedto ashaft. p p

The dough-mixing machine 10, as herein illustrated, comprises the standard ll having a forwardly projecting base 12 and an overhanging arm 13 adapted to house the actuatmg mechanism of averticalflagitator shaft I.

14. A removable connecting or sleeve member 15 having a"shield 16,-inthe formof an inverted frustum, intermediate its length, is attached to the end of shaft 14. The lower portion 17 of member 15 is adapted-tohave an agitator 18 connected therewith. Agitator 18-isadapted to project and be rotated within adough container suitably positioned upon base-12 beneath the arm 13.

The attachment ofmember 15 to the shaft 14 iseifected by abayonet slot construction comprisingthe means ofthisinvention. The

upperportion 19ofmember 15 is tubular for thepurpose ofreceiving the end of shaft 14. :A vertical slot 20 in thewall of portion 19 communicatesjwith the end of a horizontal -slot21 therein. The end portions 22 and23 of the bayonet slotthus formed are preferably rounded. A laterally projecting arm 24-is secured 'to shaft 14 adj acent the end thereof, such as by embedding the arm within the shaft as indicatedin Fig. 6. -Arm 24 is adapted to enter the slots 20 and 21-and "toabu't end portion-23 whereby member 15 is driven by the agitator shaft14.

=Heretofore, no self-locking means have been providedfor preventing driven member 15 from turning or being turnedin a reverse I direction to the movement of drivingmember 14. Such turning might takeplace, for example, at the moment of-stoppingoperation of the mixer, and as a result ofthe forces of inertia, or of the adherent andresistant fprope'rtiesof the dough clinging to the agi- =tator 18. The; alignment of arm 24 with the vertical slot 20 resulted inthe separation of member 15 from shaft 14.

upon the outer end of arm 24. A pin 27,,pr0- I jecting downwardly from the arm, extends throughaslot-28 inthe end of lug 25, and

.14 is inserted into the upper portion 19 of member 15. and the latter is turned until arm 24 enters slot 20 said arm being of such length that lug 25 is in spaced relationship with the exterior face of portion 19. It should be noted that by means of pin 27 and slot 28, the free end of lug 25 is retained in proper position to follow the arm 24 into the bayonet slot without the necessity of manually adjusting the lug to this relationship.

Stud 29 is adapted to project into the bayonet slot and follows the arm 24 thereinto,

causing lug 25 to assume a substantially parallel relationship with the-retaining portion 21 of the bayonet slot and to turn toward the release portion or vertical solt 20 when the arm 24 has been positioned in the retaining portion 21, (see Fig. 5). A looking on gagement has now been effected. The end of stud 29 rides upon the surface 30 of slot 21. When arm 24 is moved toward slot 20, stud 29 assumes an angular contact with end 22 of slot 21 as indicated at 31, Fig. 5, and prevents said arm from entering the release slot until the free end of lug 25 is given an upward start whereupon stud 29 moves upwardly into slot 20 and arm 24 is permitted to assume a releasable relationship with member 15.

It should be noted that the free end of lug 25, due to its solidity and to the added weight of stud 29, falls of its own weight when arm 24 has entered into slot 21, so that no action is required, beyond the initial insertion of arm 24 into the opening of the bayonet slot, to dispose the lug in its proper latched position.

The device of this invention may be used with drive shafts the free ends of which are disposed at various angles below and including the horizontal, so that the gravitational force operative upon lug 25 will not be such as to overcome the proper locking relationship of the parts.

What is claimed is 1. The combination with a drive shaft having a free end, of a laterally-projecting arm on said shaft adjacent the free end thereof, a removable connecting member adapted to receive the free end of the shaft, the receiving portion of said member being provided with a bayonet slot comprising a retaining and a release portion, said slot being adapted to receive said laterallyprojecting arm, and

a lug mounted for limited pivotal movement upon the end of said arm and having a stud thereon projecting into the bayonet slot upon insertion of the arm into said slot, said lug being adapted to assume a position substantially parallel with the retaining portion of the bayonet slot whereby said stud, upon movement of the arm toward the release portion of the slot, contacts the wall of said release portion, preventing movement of the arm into alignment with the release portion of the slot.

2. The combination with a drive shaft having a free end, of a laterally-projecting arm on the shaft adjacent the free end thereof, a lug pivotally mounted at one of its ends upon the end of said laterally-projecting arm, a laterally-extending pin on said arm and pro jecting through a slot in said lug whereby to limit pivotal movement of the lug, a stud on the lug adjacent the free end thereof and exable connecting member adapted to receive the end of the drive shaft and provided with a bayonet slot for receiving the arm on the drive shaft said slot comprising a retaining and'a release portion, said lug being adapted, 1

upon insertion of the arm in the bayonet slot, to assume a position substantially parallel with the retaining portion of the slot and in spaced relationship with the connecting member, said stud being adapted to project into the slot and to contact the wall of the release portion of the slot for preventing movement of said arm into alignment with the release portion of the slot.

3. The combination of a driving member having a free end, a driven member receivable upon the free end of said driving member and provided with a bayonet slot, an arm on said free end of the driving member and tending toward the drive shaft, and a remov- 585 receivable in said slot, and a lug pivotally mounted upon the end of said arm and having a stud thereon adapted to enter said slot upon insertion of said arm therein for preventing movement of the positioned arm from the slot until said lug is pivotally moved.

4. The combination with a driving member having a free end, of a driven member receivable upon said free end and having a bayonet slot provided with a release portion, an arm on the free end of the driving member and insertable in said bayonet, and a lug pivotally mounted upon said arm and adapted, upon insertion of the arm into the slot, to contact the wall of the release portion of the slot for preventing separation of the driving and driven members until the lug is pivotally moved from said contacting position.

5. In combination a shaft, an arm extending from the shaft, a shaft receiving sleeve member having a bayonet slot therein for reception of the extending arm of the shaft, and self-positioning means on the arm for looking the shaft and sleeve member in engaged relationship.

6. In a dough mixer having an agitator shaft and an agitator, a connection between the shaft and agitator comprising the combination of a socket portion of said agitator having a bayonet slot, the agitator shaft adapted for entry into the socket portion, a pin on the shaft for entry into the bayonet slot, and a member attached to the pin for following the pin into the slot and for precluding withdrawal of the pin from the slot except subsequently to withdrawal of the last mentioned member from the slot.

7. In a bayonet catch the combination of a socket member having an angular slot, a memberfor insertion in the socket member,

a pin on the last mentioned member for entry into the slot, and a locking member attached to the pin for following the pin into the slot and for lodging at the apex of the angular slot for retaining the pin in the slot.

8. In a bayonet catch the combination of a socket member having an angular slot, a

SIGMUND SGHIFF. 

